Render loses the Glow effect

Hello,

I'm working on a Mac with Monterey 12.0.1 and After Effects Version 18.0.0.  I have a composition containing a single layer--  a rectangle that looks like a thin blue line from left to right in the center of the screen. I added the glow effect to make the line appear to pulse. There's no background.  I want to use this clip as an overlay in a different project. It looks great when I run it in After Effects. When I render it, the blue rectangle is there, but there's no glow at all.  I set the Output Module to format QuickTime and in the Video Output section I set Channels to RGB + Alpha.

I searched online to see if anyone else had this issue. I found one post that suggested turning off the GPU Acceleration in the Project Settings and using the software only option.  I tried this too.  It did not solve the problem.  My output video has the thin blue rectangle, but no pulsing glow.

Why does the render not include the glow effect?  How can I fix this?

Any suggestions would be appreciated!